Re: [NTG-context] MkIV italic correction?
Khaled Hosny wrote: On Wed, May 27, 2009 at 01:34:57PM +0900, Dohyun Kim wrote: 2009/5/22 Taco Hoekwater : Hans Hagen wrote: Taco Hoekwater wrote: Khaled Hosny wrote: Not very helpful in this situation, but FontForge has a non-standard italic correction (ITLC) table[1], may be TeX related OpenTyp font projects like Latin Modern and Gyre fonts can use it? That would perhaps not be a bad idea. If that table is there then luatex will automatically use it (it is a subtable of 'TeX ', which also contains height and depth information, and font dimensions). so, that data would end up in a regular feature/lookup? of is it an entry in the glyph? They are automatically merged into the glyph, as glyph.italic_correction glyph.tex_height glyph.tex_depth Hi, Considering current state that we don't know any fonts that has ITLC table, it would be better than nothing to implement italic correction as follows. Per FontForge's documentation, it can generate italic correction values, may be LuaTeX could make use of such feature and provide a way to generate italic correction values for fonts missing it, may be the tex height and depth too, if it isn't doing so already? Since FontForge has access to actual glyph shapes, it might be generating better guesses. I can generate sample fonts with FontForge for testing, if needed. as such an italic correction is not part of the font design but a guess it makes sense to keep it 'under lua control' so i implemented a itls=yes feature (base mode and node mode; is in beta) Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
On Wed, May 27, 2009 at 01:34:57PM +0900, Dohyun Kim wrote: > 2009/5/22 Taco Hoekwater : > > > > > > Hans Hagen wrote: > >> Taco Hoekwater wrote: > >>> > >>> Khaled Hosny wrote: > Not very helpful in this situation, but FontForge has a non-standard > italic correction (ITLC) table[1], may be TeX related OpenTyp font > projects like Latin Modern and Gyre fonts can use it? > >>> > >>> That would perhaps not be a bad idea. If that table is there then > >>> luatex will automatically use it (it is a subtable of 'TeX ', which > >>> also contains height and depth information, and font dimensions). > >> > >> so, that data would end up in a regular feature/lookup? of is it an > >> entry in the glyph? > > > > They are automatically merged into the glyph, as > > > > glyph.italic_correction > > glyph.tex_height > > glyph.tex_depth > > > > Hi, > > Considering current state that we don't know any fonts that has ITLC table, > it would be better than nothing to implement italic correction as follows. Per FontForge's documentation, it can generate italic correction values, may be LuaTeX could make use of such feature and provide a way to generate italic correction values for fonts missing it, may be the tex height and depth too, if it isn't doing so already? Since FontForge has access to actual glyph shapes, it might be generating better guesses. I can generate sample fonts with FontForge for testing, if needed. Regards, Khaled -- Khaled Hosny Arabic localiser and member of Arabeyes.org team Free font developer signature.asc Description: Digital signature ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
Dohyun Kim wrote: Considering current state that we don't know any fonts that has ITLC table, it would be better than nothing to implement italic correction as follows. In the following code, "fontdata" is a table returned by the function "fonts.define.read". local param = fontdata.parameters local italicangle = fontdata.shared.otfdata.metadata.italicangle if italicangle and italicangle < 0 then local uwidth = fontdata.shared.otfdata.metadata.uwidth or 40 local factor = fontdata.factor or 655.36 param.slant = - math.tan(italicangle*math.pi/180) * param.quad for i,v in pairs(fontdata.characters) do local gl = fontdata.descriptions[i] local it = (gl.boundingbox[3] - gl.width + uwidth*0.5) * factor if it > 0 then v.italic = it end end end there are seleveral solutions: - extend the font with this info (faster but then it's always there which might not be ok as it's an approximation) - calculate it after loading (which is what you propose) in the mkiv code we do have a hook for that kind of things so this is then what i propose. watch how we don't scale here, we just add an entry to the shared data as that's where we hook in; the real implementation would look slightly different as an optimization is possible \starttext \startluacode table.insert(fonts.triggers,"itlc") local function itlc(tfmdata,value) if value then -- the magic 40 and it formula come from Dohyun Kim local fontdata = tfmdata.shared.otfdata or tfmdata.shared.afmdata local metadata = fontdata and fontdata.metadata if metadata then local italicangle = metadata.italicangle if italicangle and italicangle ~= 0 then local uwidth = (metadata.uwidth or 40)/2 for unicode, d in next, tfmdata.descriptions do local it = d.boundingbox[3] - d.width + uwidth if it ~= 0 then d.italic = it end end end end end end fonts.initializers.base.otf.itlc = itlc fonts.initializers.node.otf.itlc = itlc fonts.initializers.base.afm.itlc = itlc fonts.initializers.node.afm.itlc = itlc \stopluacode \definedfont[SerifItalic*default at 24pt] test\/test \definefontfeature[xdefault][default][itlc=yes] \definedfont[SerifItalic*xdefault at 24pt] test\/test \stoptext i could add it to the generic code (although i'm not going to add all the other context goodies to the generic code definitely not as long as they're experimental) - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
2009/5/22 Taco Hoekwater : > > > Hans Hagen wrote: >> Taco Hoekwater wrote: >>> >>> Khaled Hosny wrote: Not very helpful in this situation, but FontForge has a non-standard italic correction (ITLC) table[1], may be TeX related OpenTyp font projects like Latin Modern and Gyre fonts can use it? >>> >>> That would perhaps not be a bad idea. If that table is there then >>> luatex will automatically use it (it is a subtable of 'TeX ', which >>> also contains height and depth information, and font dimensions). >> >> so, that data would end up in a regular feature/lookup? of is it an >> entry in the glyph? > > They are automatically merged into the glyph, as > > glyph.italic_correction > glyph.tex_height > glyph.tex_depth > Hi, Considering current state that we don't know any fonts that has ITLC table, it would be better than nothing to implement italic correction as follows. In the following code, "fontdata" is a table returned by the function "fonts.define.read". local param = fontdata.parameters local italicangle = fontdata.shared.otfdata.metadata.italicangle if italicangle and italicangle < 0 then local uwidth = fontdata.shared.otfdata.metadata.uwidth or 40 local factor = fontdata.factor or 655.36 param.slant = - math.tan(italicangle*math.pi/180) * param.quad for i,v in pairs(fontdata.characters) do local gl = fontdata.descriptions[i] local it = (gl.boundingbox[3] - gl.width + uwidth*0.5) * factor if it > 0 then v.italic = it end end end Best, Dohyun Kim ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
Hans Hagen wrote: > Taco Hoekwater wrote: >> >> Khaled Hosny wrote: >>> Not very helpful in this situation, but FontForge has a non-standard >>> italic correction (ITLC) table[1], may be TeX related OpenTyp font >>> projects like Latin Modern and Gyre fonts can use it? >> >> That would perhaps not be a bad idea. If that table is there then >> luatex will automatically use it (it is a subtable of 'TeX ', which >> also contains height and depth information, and font dimensions). > > so, that data would end up in a regular feature/lookup? of is it an > entry in the glyph? They are automatically merged into the glyph, as glyph.italic_correction glyph.tex_height glyph.tex_depth Best wishes, Taco ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
Taco Hoekwater wrote: Khaled Hosny wrote: Not very helpful in this situation, but FontForge has a non-standard italic correction (ITLC) table[1], may be TeX related OpenTyp font projects like Latin Modern and Gyre fonts can use it? That would perhaps not be a bad idea. If that table is there then luatex will automatically use it (it is a subtable of 'TeX ', which also contains height and depth information, and font dimensions). so, that data would end up in a regular feature/lookup? of is it an entry in the glyph? for taco: it would be handy then to have a flag telling so, otherwise we would have to check for each glyph a field which for huge fonts is a slow downer - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
Khaled Hosny wrote: > > Not very helpful in this situation, but FontForge has a non-standard > italic correction (ITLC) table[1], may be TeX related OpenTyp font > projects like Latin Modern and Gyre fonts can use it? That would perhaps not be a bad idea. If that table is there then luatex will automatically use it (it is a subtable of 'TeX ', which also contains height and depth information, and font dimensions). Best wishes, Taco ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
Corsair wrote:
> On Thu, May 21, 2009 at 01:59:14PM +0200, Taco Hoekwater wrote:
>> Corsair wrote:
>>> On Thu, May 21, 2009 at 11:55:45AM +0200, Hans Hagen wrote:
open type fonts have no italic correction info (except in math)
>>> But I notice that using the same fonts in XeTeX produces italic
>>> correction. Is it fake?
>> I guess it is using the glyph boundingbox.
>
> Thank you. This sounds reasonable. Is there any way I can achieve
> this in MkIV? I'm currently using \def\/{\kern0.1em}, which is kinda
> dirty...
Hans could implement something like this easily, but whether it does
much good is doubtful (that square box does not actually tell you where
something sticks out, just that it does).
Best wishes,
Taco
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Re: [NTG-context] MkIV italic correction?
On Thu, May 21, 2009 at 01:59:14PM +0200, Taco Hoekwater wrote:
> Corsair wrote:
> > On Thu, May 21, 2009 at 11:55:45AM +0200, Hans Hagen wrote:
> >> open type fonts have no italic correction info (except in math)
> >
> > But I notice that using the same fonts in XeTeX produces italic
> > correction. Is it fake?
>
> I guess it is using the glyph boundingbox.
Thank you. This sounds reasonable. Is there any way I can achieve
this in MkIV? I'm currently using \def\/{\kern0.1em}, which is kinda
dirty...
--
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Re: [NTG-context] MkIV italic correction?
On Thu, May 21, 2009 at 11:55:45AM +0200, Hans Hagen wrote:
> Corsair wrote:
>> Hi all,
>>
>> Does MkIV support italic correction? Because the following code
>> produces two identical "f)"s
>>
>> \starttext
>> {\it f})
>> {\it f\/})
>> \stoptext
>
> open type fonts have no italic correction info (except in math)
Not very helpful in this situation, but FontForge has a non-standard
italic correction (ITLC) table[1], may be TeX related OpenTyp font
projects like Latin Modern and Gyre fonts can use it?
[1]http://fontforge.sourceforge.net/non-standard.html
Regards,
Khaled
--
Khaled Hosny
Arabic localiser and member of Arabeyes.org team
Free font developer
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Re: [NTG-context] MkIV italic correction?
Corsair wrote: On Thu, May 21, 2009 at 11:55:45AM +0200, Hans Hagen wrote: open type fonts have no italic correction info (except in math) But I notice that using the same fonts in XeTeX produces italic correction. Is it fake? I guess it is using the glyph boundingbox. ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
On Thu, May 21, 2009 at 11:55:45AM +0200, Hans Hagen wrote: > open type fonts have no italic correction info (except in math) But I notice that using the same fonts in XeTeX produces italic correction. Is it fake? -- There is no emotion; there is peace. There is no ignorance; there is knowledge. There is no passion; there is serenity. There is no death; there is the Force. pgpcsgfJ4LDhX.pgp Description: PGP signature ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : https://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] MkIV italic correction?
Corsair wrote:
Hi all,
Does MkIV support italic correction? Because the following code
produces two identical "f)"s
\starttext
{\it f})
{\it f\/})
\stoptext
open type fonts have no italic correction info (except in math)
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
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Re: [NTG-context] MkIV italic correction?
On Wed, May 20, 2009 at 03:21:59PM +0800, Yue Wang wrote:
> it supports italic correction by default.
Then what's your result of the code? Does it come with italic
correction?
> On Wed, May 20, 2009 at 2:25 PM, Corsair wrote:
> > Hi all,
> >
> > Does MkIV support italic correction? �Because the following code
> > produces two identical "f)"s
> >
> > \starttext
> > {\it f})
> > {\it f\/})
> > \stoptext
--
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There is no passion; there is serenity.
There is no death; there is the Force.
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Re: [NTG-context] MkIV italic correction?
it supports italic correction by default.
On Wed, May 20, 2009 at 2:25 PM, Corsair wrote:
> Hi all,
>
> Does MkIV support italic correction? Because the following code
> produces two identical "f)"s
>
> \starttext
> {\it f})
> {\it f\/})
> \stoptext
>
> --
> There is no emotion; there is peace.
> There is no ignorance; there is knowledge.
> There is no passion; there is serenity.
> There is no death; there is the Force.
>
> ___
> If your question is of interest to others as well, please add an entry to the
> Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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> ___
>
>
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[NTG-context] MkIV italic correction?
Hi all,
Does MkIV support italic correction? Because the following code
produces two identical "f)"s
\starttext
{\it f})
{\it f\/})
\stoptext
--
There is no emotion; there is peace.
There is no ignorance; there is knowledge.
There is no passion; there is serenity.
There is no death; there is the Force.
pgpTLTfcXNdmo.pgp
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